221708086137650 has 48 divisors (see below), whose sum is σ = 472082798588544. Its totient is φ = 75886015054080.

The previous prime is 221708086137617. The next prime is 221708086137679. The reversal of 221708086137650 is 56731680807122.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 533900102 + ... + 534315201.

It is an arithmetic number, because the mean of its divisors is an integer number (9835058303928).

Almost surely, 2^{221708086137650} is an apocalyptic number.

221708086137650 is an abundant number, since it is smaller than the sum of its proper divisors (250374712450894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221708086137650 is a wasteful number, since it uses less digits than its factorization.

221708086137650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068215915 (or 1068215910 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 221708086137650 in words is "two hundred twenty-one trillion, seven hundred eight billion, eighty-six million, one hundred thirty-seven thousand, six hundred fifty".